We use both but prefer the metal cages as they stand up better to our rough play style. That being said we fly a few times a year and a plastic cage with a numbered lock is what we use as they are pretty much TSA proof.
I don't have a preference. My wife is older then I and we have an amazing relationship. I have been a sub to younger people as well. It is all about the connection that we both feel rather then our ages.
Definitely a sub sissy. Heels and a g-string under a little black dress locked in chastity blond wig and makeup, waiting for instructions from my wife.
I think my friends would be stunned to find out that I am a bisexual submissive cross dressing sissy slut. My wife on the other hand loves what I am as she helped sculpt me onto the person I have become.
My wife pegs me a couple of times a week. She keeps my cock locked and dressed like her girlfriend.